From: "Jan E." <jan.e@...>
Date: 2012-03-16T22:18:38+09:00
Subject: Re: Eval. get the console result into a variable

Did you try something simple like

caught = catch_output do
  eval 'print 1'
end
p caught

If this works (it should), then there's probably something wrong with 
the string you evaluate. Does it even have output?

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